RFR: 8277122: SplitPane divider drag can hang the layout

[Marius Hanl]

On Fri, 19 Nov 2021 12:39:23 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> interesting issue - and fix :) Verified the mis-behaviour before the fix and its working after.
> 
> Wondering, though (read: I don't understand ��)
> 
> * why the layout details in the splitpane hinders the visual update of a completely unrelated component (like the combo)?
> * why does it only happen on increasing the divider pos, not on decreasing?
> 
> As to the test: would prefer to also see a test of the fixed effect (vs. the fix implementation of not re-entering layout) - might be a bit tricky, though.

- the combobox is a children of the splitpane, so therefore it is affected by the invalid layout state of the splitpane.
- it can also happen when decreasing, it might be that you need to set the min width to 0 of the left content of the splitpane.
-> The bug is only happening if you drag the divider while being either as far on the left as possible or as far as possible on the right, so that a drag won't affect the divider since it is already at the min/max position. The layout code whoever will basically adjust the divider a second time since it would now be out of bounds

Do you mean something like checking the combobox display text?

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PR: https://git.openjdk.java.net/jfx/pull/669